Valve-dressing tool.



- J. l. BENEDICK. VALVE DRESSING TOOL. APPLICATION msn Aue.a'o,19e.

Patented July 17, 1917.

nvt/EN Tok.

A TTORNE Y6.

MTATE@ PATENT IITIE JOSEPHV J. BENEDICK, 0F CHICAGO, ILLINOIS.

VALVE-DRESSING TOOL.

Specification of Letters Patent.

Patented July 17, 1917..

Application led August 30, 1916. Serial No. 117,691.

new and useful Improvements in a Valve, Dressing Tool, of which the following is a specification.

My present invention relates to improvements in valve dressing tools, and has special reference to the provision of such a tool for dressing the conical or inclined valve seating surface of pop-valves such as are widely used in internal combustion engines. When rthe valve seat is originally prepared for the reception of the valve or `when it is resurfaced to remove a badly worn or pitted condition, it is obvious that the valve seating surface must be given the exact size and inclination of the seat. This may be l easily done with my present tool by placing the tool with which the valve seat was worked in my tool and adjusting the cutting member to the size and inclination thereof.

If the trouble is entirely with the seating surface of the valve and not in the valve seat itself, the proper inclination can be found by placing the old valve in my tool and then making the necessary adjustment to secure the proper taper and to take olf in the dressing operation suiicient metal to properly resurface the part.

There is more or less chattering or vibration between the tool and the work in tooling metal in the ordinary manner which results in an uneven surface. This has to be avoided in valve dressing and I have provided adjustments to avoid chattering in my present tool. These adjustments comprise facilities for presenting the tool to the work in the manner hereinafter described, and for securing a nice fit for the valve stem which will secure its even rotation. I have also provided a simple means for setting the tool to take olf a predetermined amount of the metal, and no more, so that after the tool is set by an experienced person, the resurfacing may be ldone by anyone who may be ordered to do it, without the danger of taking off too much metal and ruining the valve.

Other objects of my invention are to provide the above facilities in a simple structure, inexpensively made and easy to adjust and operate. Y

I attain the above objects by means of the structure illustrated in the accompanying 'i drawing, in which,-

Figurel is an elevation of my invention.

Fig. 2 is a plan of the structure shown in .L'lg- Eig. 3 is a vertical sectional view through the adjustable bushing.

Fig. 4c shows the angular presentation of the tool to the work; and

Figs. 5 and 6 are respectively an elevation and a plan of a modified form of tool and work-holding bracket.

Similar reference characters refer to similar parts throughout the several views.

My tool preferably comprises a body portion, 6, having at least two parallel sides, 7, and, t3, so as to permit of its being readily held in a vise. This body portion is longitudinally-bored and at least partially interiorly threaded, as at 9, to receive the interiorly and exteriorly threaded sleeve, 10, which preferably has provided at one end a knurled annular extension, by means of which it may be screwed farther into or out of the bore of the body portion. Near the top of the body portion is a transverse cut, 11, which runs through to the central bore, and likewise a vertical cut, 12, which runs through to the bore from the top of the bodv portion to the transverse cut, 11. The partially detached part of the body portion, 13, formed by the cuts, 11, and 12, is bored at 14 and this boreis carried through into the adjacent portion o-f the body portion at 15, and the portion of the bore in the body is tapped to receive a set screw, 16, bymeans v of which the partially detached portion, 13,

of the body may be constricted about the sleeve, 10, to secure it in adjusted position. Mounted within the top and bottom of the sleeve, 10, are two exteriorly tapered and threaded bushings, 17 and 18, the top one, 17 being partially longitudinally slit, as at 19, and the bottom bushing, 18, being completely `longitudinally slit, as at 20. It will be seen that by screwing these bushings, 17, and 18, farther into or out of the sleeve, 10,

a very nice lit may be secured for the valve stein.

Extending laterally from the body portion, 6, is the tool bracket, 21, the face, 22, of which is inclined to the axis of the bushings, 17, and 18. The bracket, 21, is bored at 23 and secured to its face through the bore by means of a suitable screw is a cylindrical toolholder, 24, having a transverse tool receiving aperture, 25, therein and a set screw, 26, extending into the aperture to secure the tool in suitable or desired position. vThe yinclination of the cutting edge of the tool to correspond with the correct taper of the valve seating surface is secured byl rotating the tool holder upon its axis, and the inclination of the face, 22, of the tool bracket, 21, and the bottom of the tool aperture, 25, is such as to present the cutting g It will also be noted that the cutting edge Vof the tool extends not directly across the seating surface, but obliquely thereof, as shown in Fig. 4, which is also desirable in securing a fine surface.

In the modied form shown in Figs. 5 and 6, the cast body portion, 6, with the tool Y bracket, 21, is replaced by a piece of boiler plate, 27, orl other sheet metal of suitable thickness.. y One end of thisplate, 27, is bent to form a loop or roundcasing, 28., for the sleeve, 10, butinstead of being threaded, the looped edge is extended parallel with the body main portion, 27, of the plate and is V secured theretoby screws, 29. n By screwing up the screws, 29, the sleeve, 10, may be rigidly 'secured in place without threading the inside` of the loop, 28. By manipulating the screws, 29, va very nice ft can besecured directly between the valve' stem and `the loop, 28, and the sleeve, 10, may be dispensed with.

. Opposite the loop orcasing, 28,7the plate,

l 27 ,I is bent at a suitable angleand bored to form a tool holding Wing, 30, to which the tool holder, 24C, is secured in the same manner it is secured to the tool bracket, 21, in the previously described form.

What I claim is 1. A valve dressing tool comprising means for rotatably receiving a valve stem, and separate means adjustably carried by said first mentioned means for holding a tool obliquely with respect to the path of rotation about the axis of said valve stem receiving means and with the cutting edge of said tool in a plane at a desired angle with said axis.

2. In a valve dressing tool adjustable means for rotatably receiving a valve stem comprising a casing an interiorly threaded sleeve, means for adjustably securing said sleeve iny said casing, and a plurality of exteriorly tapered and threaded bushings having transverse slots therein adapted to screw into vsaid sleeve.

3. In a valve dressing tool adjustable means for rotatably receiving a valve stem comprising an interiorly threaded casing and an interiorly and exteriorly threaded sleeve, means for adjustably securing said sleeve in said casing, and a plurality of exteriorly tapered and threaded bushings havingtransverse slots therein adapted to screw into said sleeve.

4. In a valve dressing tool means for rotatably receiving a valve stem, a tool holding wing'disposed in a plane at an anglel to any plane of the axis of said valve receiving means, a tool holder and means for adjustably securing said tool holder to said wing.

Signed at Chicago, county of Cook, and State of Illinois, this 26th day of August,

JOSEPH J. BENEDICK. Witnesses;

I-I. SLAox, BENJ. T. RooDHoUsE.

lolgirie'sof this-patent inay be obtained for ve cents each, by addressing the Commissioner of Patents,

"' Washington, D. G. 

